/*************************************************************************/
/*  polygon_2d_editor_plugin.cpp                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#include "polygon_2d_editor_plugin.h"
#include "canvas_item_editor_plugin.h"
#include "os/file_access.h"
#include "tools/editor/editor_settings.h"
#include "os/keyboard.h"
#include "os/input.h"

void Polygon2DEditor::_notification(int p_what) {

	switch(p_what) {

		case NOTIFICATION_READY: {

			button_create->set_icon( get_icon("Edit","EditorIcons"));
			button_edit->set_icon( get_icon("MovePoint","EditorIcons"));
			button_edit->set_pressed(true);
			button_uv->set_icon( get_icon("Uv","EditorIcons"));

			uv_button[UV_MODE_EDIT_POINT]->set_icon(get_icon("ToolSelect","EditorIcons"));
			uv_button[UV_MODE_MOVE]->set_icon(get_icon("ToolMove","EditorIcons"));
			uv_button[UV_MODE_ROTATE]->set_icon(get_icon("ToolRotate","EditorIcons"));
			uv_button[UV_MODE_SCALE]->set_icon(get_icon("ToolScale","EditorIcons"));

			b_snap_grid->set_icon( get_icon("Grid", "EditorIcons"));
			b_snap_enable->set_icon( get_icon("Snap", "EditorIcons"));
			uv_icon_zoom->set_texture( get_icon("Zoom", "EditorIcons"));

			get_tree()->connect("node_removed", this, "_node_removed");

		} break;
		case NOTIFICATION_FIXED_PROCESS: {


		} break;
	}

}
void Polygon2DEditor::_node_removed(Node *p_node) {

	if(p_node==node) {
		edit(NULL);
		hide();

		canvas_item_editor->get_viewport_control()->update();
	}

}


void Polygon2DEditor::_menu_option(int p_option) {

	switch(p_option) {

		case MODE_CREATE: {

			mode=MODE_CREATE;
			button_create->set_pressed(true);
			button_edit->set_pressed(false);
		} break;
		case MODE_EDIT: {

			mode=MODE_EDIT;
			button_create->set_pressed(false);
			button_edit->set_pressed(true);
		} break;
		case MODE_EDIT_UV: {

			if (node->get_texture().is_null()) {

				error->set_text("No texture in this polygon.\nSet a texture to be able to edit UV.");
				error->popup_centered_minsize();
				return;
			}


			PoolVector<Vector2> points = node->get_polygon();
			PoolVector<Vector2> uvs = node->get_uv();
			if (uvs.size()!=points.size()) {
				undo_redo->create_action(TTR("Create UV Map"));
				undo_redo->add_do_method(node,"set_uv",points);
				undo_redo->add_undo_method(node,"set_uv",uvs);
				undo_redo->add_do_method(uv_edit_draw,"update");
				undo_redo->add_undo_method(uv_edit_draw,"update");
				undo_redo->commit_action();

			}


			uv_edit->popup_centered_ratio(0.85);
		} break;
		case UVEDIT_POLYGON_TO_UV: {

			PoolVector<Vector2> points = node->get_polygon();
			if (points.size()==0)
				break;
			PoolVector<Vector2> uvs = node->get_uv();
			undo_redo->create_action(TTR("Create UV Map"));
			undo_redo->add_do_method(node,"set_uv",points);
			undo_redo->add_undo_method(node,"set_uv",uvs);
			undo_redo->add_do_method(uv_edit_draw,"update");
			undo_redo->add_undo_method(uv_edit_draw,"update");
			undo_redo->commit_action();


		} break;
		case UVEDIT_UV_TO_POLYGON: {

			PoolVector<Vector2> points = node->get_polygon();
			PoolVector<Vector2> uvs = node->get_uv();
			if (uvs.size()==0)
				break;

			undo_redo->create_action(TTR("Create UV Map"));
			undo_redo->add_do_method(node,"set_polygon",uvs);
			undo_redo->add_undo_method(node,"set_polygon",points);
			undo_redo->add_do_method(uv_edit_draw,"update");
			undo_redo->add_undo_method(uv_edit_draw,"update");
			undo_redo->commit_action();

		} break;
		case UVEDIT_UV_CLEAR: {

			PoolVector<Vector2> uvs = node->get_uv();
			if (uvs.size()==0)
				break;
			undo_redo->create_action(TTR("Create UV Map"));
			undo_redo->add_do_method(node,"set_uv",PoolVector<Vector2>());
			undo_redo->add_undo_method(node,"set_uv",uvs);
			undo_redo->add_do_method(uv_edit_draw,"update");
			undo_redo->add_undo_method(uv_edit_draw,"update");
			undo_redo->commit_action();

		} break;


	}
}

void Polygon2DEditor::_set_use_snap(bool p_use)
{
	use_snap=p_use;
}

void Polygon2DEditor::_set_show_grid(bool p_show)
{
	snap_show_grid=p_show;
	uv_edit_draw->update();
}

void Polygon2DEditor::_set_snap_off_x(float p_val)
{
	snap_offset.x=p_val;
	uv_edit_draw->update();
}

void Polygon2DEditor::_set_snap_off_y(float p_val)
{
	snap_offset.y=p_val;
	uv_edit_draw->update();
}

void Polygon2DEditor::_set_snap_step_x(float p_val)
{
	snap_step.x=p_val;
	uv_edit_draw->update();
}

void Polygon2DEditor::_set_snap_step_y(float p_val)
{
	snap_step.y=p_val;
	uv_edit_draw->update();
}

void Polygon2DEditor::_wip_close() {

	undo_redo->create_action(TTR("Create Poly"));
	undo_redo->add_undo_method(node,"set_polygon",node->get_polygon());
	undo_redo->add_do_method(node,"set_polygon",wip);
	undo_redo->add_do_method(canvas_item_editor->get_viewport_control(),"update");
	undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(),"update");
	undo_redo->commit_action();
	wip.clear();
	wip_active=false;
	mode=MODE_EDIT;
	button_edit->set_pressed(true);
	button_create->set_pressed(false);
	edited_point=-1;
}

bool Polygon2DEditor::forward_gui_input(const InputEvent& p_event) {

	if (node==NULL)
		return false;

	switch(p_event.type) {

		case InputEvent::MOUSE_BUTTON: {

			const InputEventMouseButton &mb=p_event.mouse_button;

			Matrix32 xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();


			Vector2 gpoint = Point2(mb.x,mb.y);
			Vector2 cpoint = canvas_item_editor->get_canvas_transform().affine_inverse().xform(gpoint);
			cpoint=canvas_item_editor->snap_point(cpoint);
			cpoint = node->get_global_transform().affine_inverse().xform(cpoint);


			Vector<Vector2> poly = Variant(node->get_polygon());

			//first check if a point is to be added (segment split)
			real_t grab_treshold=EDITOR_DEF("editors/poly_editor/point_grab_radius",8);

			switch(mode) {


				case MODE_CREATE: {

					if (mb.button_index==BUTTON_LEFT && mb.pressed) {


						if (!wip_active) {

							wip.clear();
							wip.push_back( cpoint-node->get_offset() );
							wip_active=true;
							edited_point_pos=cpoint;
							canvas_item_editor->get_viewport_control()->update();
							edited_point=1;
							return true;
						} else {


							if (wip.size()>1 && xform.xform(wip[0]+node->get_offset()).distance_to(gpoint)<grab_treshold) {
								//wip closed
								_wip_close();

								return true;
							} else {

								wip.push_back( cpoint-node->get_offset() );
								edited_point=wip.size();
								canvas_item_editor->get_viewport_control()->update();
								return true;

								//add wip point
							}
						}
					} else if (mb.button_index==BUTTON_RIGHT && mb.pressed && wip_active) {
						_wip_close();
					}



				} break;

				case MODE_EDIT: {

					if (mb.button_index==BUTTON_LEFT) {
						if (mb.pressed) {

							if (mb.mod.control) {


								if (poly.size() < 3) {

									undo_redo->create_action(TTR("Edit Poly"));
									undo_redo->add_undo_method(node,"set_polygon",poly);
									poly.push_back(cpoint);
									undo_redo->add_do_method(node,"set_polygon",poly);
									undo_redo->add_do_method(canvas_item_editor->get_viewport_control(),"update");
									undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(),"update");
									undo_redo->commit_action();
									return true;
								}

								//search edges
								int closest_idx=-1;
								Vector2 closest_pos;
								real_t closest_dist=1e10;
								for(int i=0;i<poly.size();i++) {

									Vector2 points[2] ={ xform.xform(poly[i]+node->get_offset()),
										xform.xform(poly[(i+1)%poly.size()]+node->get_offset()) };

									Vector2 cp = Geometry::get_closest_point_to_segment_2d(gpoint,points);
									if (cp.distance_squared_to(points[0])<CMP_EPSILON2 || cp.distance_squared_to(points[1])<CMP_EPSILON2)
										continue; //not valid to reuse point

									real_t d = cp.distance_to(gpoint);
									if (d<closest_dist && d<grab_treshold) {
										closest_dist=d;
										closest_pos=cp;
										closest_idx=i;
									}


								}

								if (closest_idx>=0) {

									pre_move_edit=poly;
									poly.insert(closest_idx+1,xform.affine_inverse().xform(closest_pos)-node->get_offset());
									edited_point=closest_idx+1;
									edited_point_pos=xform.affine_inverse().xform(closest_pos);
									node->set_polygon(Variant(poly));
									canvas_item_editor->get_viewport_control()->update();
									return true;
								}
							} else {

								//look for points to move

								int closest_idx=-1;
								Vector2 closest_pos;
								real_t closest_dist=1e10;
								for(int i=0;i<poly.size();i++) {

									Vector2 cp =xform.xform(poly[i]+node->get_offset());

									real_t d = cp.distance_to(gpoint);
									if (d<closest_dist && d<grab_treshold) {
										closest_dist=d;
										closest_pos=cp;
										closest_idx=i;
									}

								}

								if (closest_idx>=0) {

									pre_move_edit=poly;
									edited_point=closest_idx;
									edited_point_pos=xform.affine_inverse().xform(closest_pos);
									canvas_item_editor->get_viewport_control()->update();
									return true;
								}
							}
						} else {

							if (edited_point!=-1) {

								//apply

								ERR_FAIL_INDEX_V(edited_point,poly.size(),false);
								poly[edited_point]=edited_point_pos-node->get_offset();
								undo_redo->create_action(TTR("Edit Poly"));
								undo_redo->add_do_method(node,"set_polygon",poly);
								undo_redo->add_undo_method(node,"set_polygon",pre_move_edit);
								undo_redo->add_do_method(canvas_item_editor->get_viewport_control(),"update");
								undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(),"update");
								undo_redo->commit_action();

								edited_point=-1;
								return true;
							}
						}
					} if (mb.button_index==BUTTON_RIGHT && mb.pressed && edited_point==-1) {



						int closest_idx=-1;
						Vector2 closest_pos;
						real_t closest_dist=1e10;
						for(int i=0;i<poly.size();i++) {

							Vector2 cp =xform.xform(poly[i]+node->get_offset());

							real_t d = cp.distance_to(gpoint);
							if (d<closest_dist && d<grab_treshold) {
								closest_dist=d;
								closest_pos=cp;
								closest_idx=i;
							}

						}

						if (closest_idx>=0) {


							undo_redo->create_action(TTR("Edit Poly (Remove Point)"));
							undo_redo->add_undo_method(node,"set_polygon",poly);
							poly.remove(closest_idx);
							undo_redo->add_do_method(node,"set_polygon",poly);
							undo_redo->add_do_method(canvas_item_editor->get_viewport_control(),"update");
							undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(),"update");
							undo_redo->commit_action();
							return true;
						}

					}



				} break;
			}



		} break;
		case InputEvent::MOUSE_MOTION: {

			const InputEventMouseMotion &mm=p_event.mouse_motion;

			if (edited_point!=-1 && (wip_active || mm.button_mask&BUTTON_MASK_LEFT)) {

				Vector2 gpoint = Point2(mm.x,mm.y);
				Vector2 cpoint = canvas_item_editor->get_canvas_transform().affine_inverse().xform(gpoint);
				cpoint=canvas_item_editor->snap_point(cpoint);
				edited_point_pos = node->get_global_transform().affine_inverse().xform(cpoint);

				canvas_item_editor->get_viewport_control()->update();

			}

		} break;
	}

	return false;
}
void Polygon2DEditor::_canvas_draw() {

	if (!node)
		return;

	Control *vpc = canvas_item_editor->get_viewport_control();

	Vector<Vector2> poly;

	if (wip_active)
		poly=wip;
	else
		poly=Variant(node->get_polygon());


	Matrix32 xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();
	Ref<Texture> handle= get_icon("EditorHandle","EditorIcons");

	for(int i=0;i<poly.size();i++) {


		Vector2 p,p2;
		p = i==edited_point ? edited_point_pos : (poly[i]+node->get_offset());
		if ((wip_active && i==poly.size()-1) || (((i+1)%poly.size())==edited_point))
			p2=edited_point_pos;
		else
			p2 = poly[(i+1)%poly.size()]+node->get_offset();

		Vector2 point = xform.xform(p);
		Vector2 next_point = xform.xform(p2);

		Color col=Color(1,0.3,0.1,0.8);
		vpc->draw_line(point,next_point,col,2);
		vpc->draw_texture(handle,point-handle->get_size()*0.5);
	}
}


void Polygon2DEditor::_uv_mode(int p_mode) {


	uv_mode=UVMode(p_mode);
	for(int i=0;i<UV_MODE_MAX;i++) {
		uv_button[i]->set_pressed(p_mode==i);
	}
}


void Polygon2DEditor::_uv_input(const InputEvent& p_input) {


	Matrix32 mtx;
	mtx.elements[2]=-uv_draw_ofs;
	mtx.scale_basis(Vector2(uv_draw_zoom,uv_draw_zoom));

	if (p_input.type==InputEvent::MOUSE_BUTTON) {


		const InputEventMouseButton &mb=p_input.mouse_button;

		if (mb.button_index==BUTTON_LEFT) {


			if (mb.pressed) {

				uv_drag_from=Vector2(mb.x,mb.y);
				uv_drag=true;
				uv_prev=node->get_uv();
				uv_move_current=uv_mode;
				if (uv_move_current==UV_MODE_EDIT_POINT) {

					if (mb.mod.shift && mb.mod.command)
						uv_move_current=UV_MODE_SCALE;
					else if (mb.mod.shift)
						uv_move_current=UV_MODE_MOVE;
					else if (mb.mod.command)
						uv_move_current=UV_MODE_ROTATE;
				}

				if (uv_move_current==UV_MODE_EDIT_POINT) {

					uv_drag_index=-1;
					for(int i=0;i<uv_prev.size();i++) {

						Vector2 tuv=mtx.xform(uv_prev[i]);
						if (tuv.distance_to(Vector2(mb.x,mb.y))<8) {
							uv_drag_from=tuv;
							uv_drag_index=i;
						}
					}

					if (uv_drag_index==-1) {
						uv_drag=false;
					}

				}
			} else if (uv_drag) {

				undo_redo->create_action(TTR("Transform UV Map"));
				undo_redo->add_do_method(node,"set_uv",node->get_uv());
				undo_redo->add_undo_method(node,"set_uv",uv_prev);
				undo_redo->add_do_method(uv_edit_draw,"update");
				undo_redo->add_undo_method(uv_edit_draw,"update");
				undo_redo->commit_action();

				uv_drag=false;
			}

		} else if (mb.button_index==BUTTON_RIGHT && mb.pressed) {

			if (uv_drag) {

				uv_drag=false;
				node->set_uv(uv_prev);
				uv_edit_draw->update();
			}

		} else if (mb.button_index==BUTTON_WHEEL_UP && mb.pressed) {

			uv_zoom->set_value( uv_zoom->get_value()/0.9 );
		} else if (mb.button_index==BUTTON_WHEEL_DOWN && mb.pressed) {

			uv_zoom->set_value( uv_zoom->get_value()*0.9);
		}

	} else if (p_input.type==InputEvent::MOUSE_MOTION) {

		const InputEventMouseMotion &mm=p_input.mouse_motion;

		if (mm.button_mask&BUTTON_MASK_MIDDLE || Input::get_singleton()->is_key_pressed(KEY_SPACE)) {

			Vector2 drag(mm.relative_x,mm.relative_y);
			uv_hscroll->set_value( uv_hscroll->get_value()-drag.x );
			uv_vscroll->set_value( uv_vscroll->get_value()-drag.y );

		} else if (uv_drag) {

			Vector2 uv_drag_to=snap_point(Vector2(mm.x,mm.y));
			Vector2 drag = mtx.affine_inverse().xform(uv_drag_to) - mtx.affine_inverse().xform(uv_drag_from);


			switch(uv_move_current) {

				case UV_MODE_EDIT_POINT: {

					PoolVector<Vector2> uv_new=uv_prev;
					uv_new.set( uv_drag_index, uv_new[uv_drag_index]+drag );
					node->set_uv(uv_new);
				} break;
				case UV_MODE_MOVE: {

					PoolVector<Vector2> uv_new=uv_prev;
					for(int i=0;i<uv_new.size();i++)
						uv_new.set( i, uv_new[i]+drag );

					node->set_uv(uv_new);


				} break;
				case UV_MODE_ROTATE: {

					Vector2 center;
					PoolVector<Vector2> uv_new=uv_prev;

					for(int i=0;i<uv_new.size();i++)
						center+=uv_prev[i];
					center/=uv_new.size();

					float angle = (uv_drag_from - mtx.xform(center)).normalized().angle_to( (uv_drag_to - mtx.xform(center)).normalized() );

					for(int i=0;i<uv_new.size();i++) {
						Vector2 rel = uv_prev[i] - center;
						rel=rel.rotated(angle);
						uv_new.set(i,center+rel);
					}

					node->set_uv(uv_new);

				} break;
				case UV_MODE_SCALE: {

					Vector2 center;
					PoolVector<Vector2> uv_new=uv_prev;

					for(int i=0;i<uv_new.size();i++)
						center+=uv_prev[i];
					center/=uv_new.size();

					float from_dist = uv_drag_from.distance_to(mtx.xform(center));
					float to_dist = uv_drag_to.distance_to(mtx.xform(center));
					if (from_dist<2)
						break;

					float scale = to_dist/from_dist;


					for(int i=0;i<uv_new.size();i++) {
						Vector2 rel = uv_prev[i] - center;
						rel=rel*scale;
						uv_new.set(i,center+rel);
					}

					node->set_uv(uv_new);
				} break;


			}
			uv_edit_draw->update();
		}

	}

}


void Polygon2DEditor::_uv_scroll_changed(float) {

	if (updating_uv_scroll)
		return;

	uv_draw_ofs.x=uv_hscroll->get_value();
	uv_draw_ofs.y=uv_vscroll->get_value();
	uv_draw_zoom=uv_zoom->get_value();
	uv_edit_draw->update();
}

void Polygon2DEditor::_uv_draw() {

	Ref<Texture> base_tex = node->get_texture();
	if (base_tex.is_null())
		return;

	Matrix32 mtx;
	mtx.elements[2]=-uv_draw_ofs;
	mtx.scale_basis(Vector2(uv_draw_zoom,uv_draw_zoom));

	VS::get_singleton()->canvas_item_set_clip(uv_edit_draw->get_canvas_item(),true);
	VS::get_singleton()->canvas_item_add_set_transform(uv_edit_draw->get_canvas_item(),mtx);
	uv_edit_draw->draw_texture(base_tex,Point2());
	VS::get_singleton()->canvas_item_add_set_transform(uv_edit_draw->get_canvas_item(),Matrix32());

	if (snap_show_grid) {
		Size2 s = uv_edit_draw->get_size();
		int last_cell;

		if (snap_step.x!=0) {
			for(int i=0;i<s.width;i++) {
				int cell = Math::fast_ftoi(Math::floor((mtx.affine_inverse().xform(Vector2(i,0)).x-snap_offset.x)/snap_step.x));
				if (i==0)
					last_cell=cell;
				if (last_cell!=cell)
					uv_edit_draw->draw_line(Point2(i,0),Point2(i,s.height),Color(0.3,0.7,1,0.3));
				last_cell=cell;
			}
		}

		if (snap_step.y!=0) {
			for(int i=0;i<s.height;i++) {
				int cell = Math::fast_ftoi(Math::floor((mtx.affine_inverse().xform(Vector2(0,i)).y-snap_offset.y)/snap_step.y));
				if (i==0)
					last_cell=cell;
				if (last_cell!=cell)
					uv_edit_draw->draw_line(Point2(0,i),Point2(s.width,i),Color(0.3,0.7,1,0.3));
				last_cell=cell;
			}
		}
	}

	PoolVector<Vector2> uvs = node->get_uv();
	Ref<Texture> handle = get_icon("EditorHandle","EditorIcons");

	Rect2 rect(Point2(),mtx.basis_xform(base_tex->get_size()));
	rect.expand_to(mtx.basis_xform(uv_edit_draw->get_size()));

	for(int i=0;i<uvs.size();i++) {

		int next = (i+1)%uvs.size();
		uv_edit_draw->draw_line(mtx.xform(uvs[i]),mtx.xform(uvs[next]),Color(0.9,0.5,0.5),2);
		uv_edit_draw->draw_texture(handle,mtx.xform(uvs[i])-handle->get_size()*0.5);
		rect.expand_to(mtx.basis_xform(uvs[i]));
	}

	rect=rect.grow(200);
	updating_uv_scroll=true;
	uv_hscroll->set_min(rect.pos.x);
	uv_hscroll->set_max(rect.pos.x+rect.size.x);
	uv_hscroll->set_page(uv_edit_draw->get_size().x);
	uv_hscroll->set_value(uv_draw_ofs.x);
	uv_hscroll->set_step(0.001);

	uv_vscroll->set_min(rect.pos.y);
	uv_vscroll->set_max(rect.pos.y+rect.size.y);
	uv_vscroll->set_page(uv_edit_draw->get_size().y);
	uv_vscroll->set_value(uv_draw_ofs.y);
	uv_vscroll->set_step(0.001);
	updating_uv_scroll=false;

}

void Polygon2DEditor::edit(Node *p_collision_polygon) {

	if (!canvas_item_editor) {
		canvas_item_editor=CanvasItemEditor::get_singleton();
	}

	if (p_collision_polygon) {

		node=p_collision_polygon->cast_to<Polygon2D>();
		if (!canvas_item_editor->get_viewport_control()->is_connected("draw",this,"_canvas_draw"))
			canvas_item_editor->get_viewport_control()->connect("draw",this,"_canvas_draw");

		wip.clear();
		wip_active=false;
		edited_point=-1;

	} else {

		node=NULL;

		if (canvas_item_editor->get_viewport_control()->is_connected("draw",this,"_canvas_draw"))
			canvas_item_editor->get_viewport_control()->disconnect("draw",this,"_canvas_draw");

	}

}

void Polygon2DEditor::_bind_methods() {

	ClassDB::bind_method(_MD("_menu_option"),&Polygon2DEditor::_menu_option);
	ClassDB::bind_method(_MD("_canvas_draw"),&Polygon2DEditor::_canvas_draw);
	ClassDB::bind_method(_MD("_uv_mode"),&Polygon2DEditor::_uv_mode);
	ClassDB::bind_method(_MD("_uv_draw"),&Polygon2DEditor::_uv_draw);
	ClassDB::bind_method(_MD("_uv_input"),&Polygon2DEditor::_uv_input);
	ClassDB::bind_method(_MD("_uv_scroll_changed"),&Polygon2DEditor::_uv_scroll_changed);
	ClassDB::bind_method(_MD("_node_removed"),&Polygon2DEditor::_node_removed);
	ClassDB::bind_method(_MD("_set_use_snap"),&Polygon2DEditor::_set_use_snap);
	ClassDB::bind_method(_MD("_set_show_grid"),&Polygon2DEditor::_set_show_grid);
	ClassDB::bind_method(_MD("_set_snap_off_x"),&Polygon2DEditor::_set_snap_off_x);
	ClassDB::bind_method(_MD("_set_snap_off_y"),&Polygon2DEditor::_set_snap_off_y);
	ClassDB::bind_method(_MD("_set_snap_step_x"),&Polygon2DEditor::_set_snap_step_x);
	ClassDB::bind_method(_MD("_set_snap_step_y"),&Polygon2DEditor::_set_snap_step_y);


}

inline float _snap_scalar(float p_offset, float p_step, float p_target) {
	return p_step != 0 ? Math::stepify(p_target - p_offset, p_step) + p_offset : p_target;
}

Vector2 Polygon2DEditor::snap_point(Vector2 p_target) const {
	if (use_snap) {
		p_target.x = _snap_scalar(snap_offset.x*uv_draw_zoom-uv_draw_ofs.x, snap_step.x*uv_draw_zoom, p_target.x);
		p_target.y = _snap_scalar(snap_offset.y*uv_draw_zoom-uv_draw_ofs.y, snap_step.y*uv_draw_zoom, p_target.y);
	}

	return p_target;
}

Polygon2DEditor::Polygon2DEditor(EditorNode *p_editor) {

	node=NULL;
	canvas_item_editor=NULL;
	editor=p_editor;
	undo_redo = editor->get_undo_redo();

	snap_step=Vector2(10,10);
	use_snap=false;
	snap_show_grid=false;

	add_child( memnew( VSeparator ));
	button_create = memnew( ToolButton );
	add_child(button_create);
	button_create->connect("pressed",this,"_menu_option",varray(MODE_CREATE));
	button_create->set_toggle_mode(true);

	button_edit = memnew( ToolButton );
	add_child(button_edit);
	button_edit->connect("pressed",this,"_menu_option",varray(MODE_EDIT));
	button_edit->set_toggle_mode(true);

	button_uv = memnew( ToolButton );
	add_child(button_uv);
	button_uv->connect("pressed",this,"_menu_option",varray(MODE_EDIT_UV));

	//add_constant_override("separation",0);

#if 0
	options = memnew( MenuButton );
	add_child(options);
	options->set_area_as_parent_rect();
	options->set_text("Polygon");
	//options->get_popup()->add_item("Parse BBCode",PARSE_BBCODE);
	options->get_popup()->connect("id_pressed", this,"_menu_option");
#endif

	mode = MODE_EDIT;
	wip_active=false;

	uv_mode=UV_MODE_EDIT_POINT;
	uv_edit = memnew( AcceptDialog );
	add_child(uv_edit);
	uv_edit->set_title(TTR("Polygon 2D UV Editor"));
	uv_edit->set_self_modulate(Color(1,1,1,0.9));

	VBoxContainer *uv_main_vb = memnew( VBoxContainer );
	uv_edit->add_child(uv_main_vb);
	uv_edit->set_child_rect(uv_main_vb);
	HBoxContainer *uv_mode_hb = memnew( HBoxContainer );
	uv_main_vb->add_child(uv_mode_hb);
	for(int i=0;i<UV_MODE_MAX;i++) {

		uv_button[i]=memnew( ToolButton );
		uv_button[i]->set_toggle_mode(true);
		uv_mode_hb->add_child(uv_button[i]);
		uv_button[i]->connect("pressed",this,"_uv_mode",varray(i));
		uv_button[i]->set_focus_mode(FOCUS_NONE);
	}

	uv_button[0]->set_tooltip(TTR("Move Point")+"\n"+TTR("Ctrl: Rotate")+"\n"+TTR("Shift: Move All")+"\n"+TTR("Shift+Ctrl: Scale"));
	uv_button[1]->set_tooltip(TTR("Move Polygon"));
	uv_button[2]->set_tooltip(TTR("Rotate Polygon"));
	uv_button[3]->set_tooltip(TTR("Scale Polygon"));

	uv_button[0]->set_pressed(true);
	HBoxContainer *uv_main_hb = memnew( HBoxContainer );
	uv_main_vb->add_child(uv_main_hb);
	uv_edit_draw = memnew( Control );
	uv_main_hb->add_child(uv_edit_draw);
	uv_main_hb->set_v_size_flags(SIZE_EXPAND_FILL);
	uv_edit_draw->set_h_size_flags(SIZE_EXPAND_FILL);
	uv_menu = memnew( MenuButton );
	uv_mode_hb->add_child(uv_menu);
	uv_menu->set_text(TTR("Edit"));
	uv_menu->get_popup()->add_item(TTR("Polygon->UV"),UVEDIT_POLYGON_TO_UV);
	uv_menu->get_popup()->add_item(TTR("UV->Polygon"),UVEDIT_UV_TO_POLYGON);
	uv_menu->get_popup()->add_separator();
	uv_menu->get_popup()->add_item(TTR("Clear UV"),UVEDIT_UV_CLEAR);
	uv_menu->get_popup()->connect("id_pressed",this,"_menu_option");

	uv_mode_hb->add_child( memnew( VSeparator ));

	b_snap_enable = memnew( ToolButton );
	uv_mode_hb->add_child(b_snap_enable);
	b_snap_enable->set_text(TTR("Snap"));
	b_snap_enable->set_focus_mode(FOCUS_NONE);
	b_snap_enable->set_toggle_mode(true);
	b_snap_enable->set_pressed(use_snap);
	b_snap_enable->set_tooltip(TTR("Enable Snap"));
	b_snap_enable->connect("toggled",this,"_set_use_snap");

	b_snap_grid = memnew( ToolButton );
	uv_mode_hb->add_child(b_snap_grid);
	b_snap_grid->set_text(TTR("Grid"));
	b_snap_grid->set_focus_mode(FOCUS_NONE);
	b_snap_grid->set_toggle_mode(true);
	b_snap_grid->set_pressed(snap_show_grid);
	b_snap_grid->set_tooltip(TTR("Show Grid"));
	b_snap_grid->connect("toggled",this,"_set_show_grid");

	uv_mode_hb->add_child( memnew( VSeparator ));
	uv_mode_hb->add_child( memnew( Label(TTR("Grid Offset:")) ) );

	SpinBox *sb_off_x = memnew( SpinBox );
	sb_off_x->set_min(-256);
	sb_off_x->set_max(256);
	sb_off_x->set_step(1);
	sb_off_x->set_value(snap_offset.x);
	sb_off_x->set_suffix("px");
	sb_off_x->connect("value_changed", this, "_set_snap_off_x");
	uv_mode_hb->add_child(sb_off_x);

	SpinBox *sb_off_y = memnew( SpinBox );
	sb_off_y->set_min(-256);
	sb_off_y->set_max(256);
	sb_off_y->set_step(1);
	sb_off_y->set_value(snap_offset.y);
	sb_off_y->set_suffix("px");
	sb_off_y->connect("value_changed", this, "_set_snap_off_y");
	uv_mode_hb->add_child(sb_off_y);

	uv_mode_hb->add_child( memnew( VSeparator ));
	uv_mode_hb->add_child( memnew( Label(TTR("Grid Step:")) ) );

	SpinBox *sb_step_x = memnew( SpinBox );
	sb_step_x->set_min(-256);
	sb_step_x->set_max(256);
	sb_step_x->set_step(1);
	sb_step_x->set_value(snap_step.x);
	sb_step_x->set_suffix("px");
	sb_step_x->connect("value_changed", this, "_set_snap_step_x");
	uv_mode_hb->add_child(sb_step_x);

	SpinBox *sb_step_y = memnew( SpinBox );
	sb_step_y->set_min(-256);
	sb_step_y->set_max(256);
	sb_step_y->set_step(1);
	sb_step_y->set_value(snap_step.y);
	sb_step_y->set_suffix("px");
	sb_step_y->connect("value_changed", this, "_set_snap_step_y");
	uv_mode_hb->add_child(sb_step_y);

	uv_mode_hb->add_child( memnew( VSeparator ));
	uv_icon_zoom = memnew( TextureFrame );
	uv_mode_hb->add_child( uv_icon_zoom );
	uv_zoom = memnew( HSlider );
	uv_zoom->set_min(0.01);
	uv_zoom->set_max(4);
	uv_zoom->set_value(1);
	uv_zoom->set_step(0.01);
	uv_mode_hb->add_child(uv_zoom);
	uv_zoom->set_custom_minimum_size(Size2(200,0));
	uv_zoom_value = memnew( SpinBox );
	uv_zoom->share(uv_zoom_value);
	uv_zoom_value->set_custom_minimum_size(Size2(50,0));
	uv_mode_hb->add_child(uv_zoom_value);
	uv_zoom->connect("value_changed",this,"_uv_scroll_changed");



	uv_vscroll = memnew( VScrollBar);
	uv_main_hb->add_child(uv_vscroll);
	uv_vscroll->connect("value_changed",this,"_uv_scroll_changed");
	uv_hscroll = memnew( HScrollBar );
	uv_main_vb->add_child(uv_hscroll);
	uv_hscroll->connect("value_changed",this,"_uv_scroll_changed");

	uv_edit_draw->connect("draw",this,"_uv_draw");
	uv_edit_draw->connect("gui_input",this,"_uv_input");
	uv_draw_zoom=1.0;
	uv_drag_index=-1;
	uv_drag=false;
	updating_uv_scroll=false;

	error = memnew( AcceptDialog);
	add_child(error);

}


void Polygon2DEditorPlugin::edit(Object *p_object) {


	collision_polygon_editor->edit(p_object->cast_to<Node>());
}

bool Polygon2DEditorPlugin::handles(Object *p_object) const {

	return p_object->is_class("Polygon2D");
}

void Polygon2DEditorPlugin::make_visible(bool p_visible) {

	if (p_visible) {
		collision_polygon_editor->show();
	} else {

		collision_polygon_editor->hide();
		collision_polygon_editor->edit(NULL);
	}

}

Polygon2DEditorPlugin::Polygon2DEditorPlugin(EditorNode *p_node) {

	editor=p_node;
	collision_polygon_editor = memnew( Polygon2DEditor(p_node) );
	CanvasItemEditor::get_singleton()->add_control_to_menu_panel(collision_polygon_editor);

	collision_polygon_editor->hide();

}


Polygon2DEditorPlugin::~Polygon2DEditorPlugin()
{
}

